Open the Phone app
Tap Voicemail (or press and hold 1 on the keypad)
Follow the prompts to set up voicemail
Create a voicemail password (if prompted)
Record your voicemail greeting (if prompted)
Save/confirm your greeting
If prompted, choose Default or Custom greeting
Test voicemail by calling your own number from another phone and leaving a message
If voicemail isn’t available, contact your carrier to enable voicemail services or check voicemail settings in your carrier account